Zeng Zhuo, Zuo Huakun, Xia Zhengcai, Niu Haoyu, Jiang Dequan, Liang Youyuan, Huang Hao, Yang Peng, Ouyang Zhongwen, Tian Zhaoming, Cheng Zhenxiang
Wuhan National High Magnetic Field Center & School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.
Institute for Superconducting and Electronic Materials, Australia Institute for Innovation Materials, Innovation Campus, University of Wollongong, Squires Way, North Wollongong, NSW 2500, Australia.
J Phys Chem Lett. 2023 Aug 24;14(33):7519-7525. doi: 10.1021/acs.jpclett.3c01880. Epub 2023 Aug 16.
In this study, we investigate the dynamic magnetoelectric (ME) coupling behaviors of GdFeO under pulsed magnetic fields. When a magnetic field is applied along the -axis, and the temperature is near the compensation temperature ( = 3.5 K), we observe a subtle transition involving the reversal of Fe moments at approximately 0.8 T in magnetization () measurements. This transition induces a corresponding jump in electrical polarization (), which is not present in the static field measurements. The dynamic intertwining between and signifies a competition between antiferromagnetic (AFM) coupling between Gd and Fe moments and their Zeeman energies. The robust AFM coupling leads to the reversal of Fe moments near , triggering the abrupt change in . Based on the exchange striction mechanism in the ferrimagnetic GdFeO, we propose the possibility of achieving highly magnetic field sensitive ME coupling near the compensation temperature in ferrimagnetic multiferroic orthoferrites.
在本研究中，我们研究了脉冲磁场下GdFeO的动态磁电（ME）耦合行为。当沿z轴施加磁场且温度接近补偿温度（Tc = 3.5 K）时，我们在磁化强度（M）测量中观察到一个微妙的转变，涉及Fe磁矩在约0.8 T时的反转。这种转变在电极化强度（P）中引起相应的跃变，而在静态场测量中不存在这种情况。M和P之间的动态交织表明Gd和Fe磁矩之间的反铁磁（AFM）耦合与其塞曼能量之间存在竞争。强大的AFM耦合导致Fe磁矩在Tc附近反转，引发P的突然变化。基于亚铁磁性GdFeO中的交换收缩机制，我们提出了在亚铁磁性多铁性正铁氧体的补偿温度附近实现高磁场敏感性ME耦合的可能性。
